5251263581 has 2 divisors, whose sum is σ = 5251263582. Its totient is φ = 5251263580.

The previous prime is 5251263547. The next prime is 5251263599. The reversal of 5251263581 is 1853621525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4325035225 + 926228356 = 65765^2 + 30434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5251263581 is a prime.

It is a super-2 number, since 2×5251263581² = 55151538394273887122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5251263181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625631790 + 2625631791.

It is an arithmetic number, because the mean of its divisors is an integer number (2625631791).

Almost surely, 2^5251263581 is an apocalyptic number.

It is an amenable number.

5251263581 is a deficient number, since it is larger than the sum of its proper divisors (1).

5251263581 is an equidigital number, since it uses as much as digits as its factorization.

5251263581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 38.

The square root of 5251263581 is about 72465.6027436466. The cubic root of 5251263581 is about 1738.1527474875.

The spelling of 5251263581 in words is "five billion, two hundred fifty-one million, two hundred sixty-three thousand, five hundred eighty-one".